Plugin Tag: one product:
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Allow Only 1 Product in Cart
Allows only one product in the cart at a time. Clears previous items when a new product is added. For logged-in users only.
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CartRules One Product in Cart for WooCommerce
This plugin ensures customers can only buy one product at a time.
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Single Item Cart for WooCommerce
Keep one product line in a WooCommerce cart. Adding a different product replaces the previous cart item while preserving the new item's quantity.